JPH0539554Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field The present invention relates to a magnetron device used for medical, cosmetic, etc. purposes.

(b) Conventional technology Conventionally, as this type of device, for example, the
As shown in Publication No. 8464 (H01J23/14), a reflector is provided to reflect the microwaves radiated from the output part of the magnetron, a spiral antenna is coupled to the output part of the magnetron, and the reflector and antenna are combined. Devices that direct microwaves are known.

However, since this antenna is formed in a spiral shape, it is difficult to form it to a predetermined dimension, that is, the inner circumferential length of the antenna is the same as the microwave wavelength, and the assembly and processing accuracy is poor, resulting in structural problems. Coupled with the weak vibration resistance, the impedance matching was unstable. In addition, the mechanical strength of the antenna and antenna mounting part of this device is weak, and the vibration resistance is weak, so the antenna swings during use, reducing the directivity of the microwaves radiated from the antenna, and making the oscillation efficiency unstable. There was a drawback.

(c) Problems to be solved by the invention The present invention was created in view of the above-mentioned drawbacks, and its object is to provide a magnetron device that can improve the directivity of microwaves and easily achieve impedance matching. .

(d) Means for solving the problem In order to solve the above problem, a cylindrical alignment member made of a conductive material is arranged coaxially with the output section of the magnetron in a space surrounded by a reflector.

(e) Effects With the structure as described above, the microwaves emitted from the output section of the magnetron are reflected by the matching member having a diameter smaller than that of the reflecting plate, so that the micro-net can be irradiated to a narrow range. Since this alignment member is cylindrical, it has strong mechanical strength, and therefore,
Since the vibration of the alignment member is small, directivity is not impaired. Furthermore, impedance matching can be easily achieved by adjusting the dimensions of the reflecting plate and the matching member, the mounting position of the matching member, and the like.

(F) Embodiment An embodiment of the present invention will be described in detail below based on FIGS. 1 to 3. Reference numeral 1 denotes a box-shaped synthetic resin oscillator body with an opening on one side, consisting of a pair of upper and lower cases. A magnetron 2 is installed in the center with the output section 3 facing the opening of the main body 1.
The magnetron is connected to a power supply device (not shown) via a flexible connecting cord 6 via a capacitor 4 and a transformer 5 disposed within the main body 1. 7 is the magnetron 2
A U-shaped metal air guide duct guides the air generated by a blower fan 8 installed on the side of the main body 1 to the magnetron 2.
Exhaust is exhausted to the outside of the main body through an exhaust port (not shown) formed on the side.

Reference numeral 9 denotes a reflective plate made of conductive metal that is fixed to the magnetron 2 with screws, and has an opening formed in the center, through which the output part 3 of the magnetron 2 passes and the reflective surface of the reflective plate 9 is output. It is made to be concentric with part 3. Further, the end portion of the reflector plate 9 is supported on the periphery of the opening of the main body 1 to prevent shaking due to vibration during use.

Reference numeral 10 denotes a cylindrical conductive metal matching member disposed in a space surrounded by the reflection plate 9, and an insulator 11
is supported concentrically with the output section 3 of the magnetron 2. The alignment member 10 includes a reflection plate 9
The edge of the side that entered the space surrounded by and the reflective plate 9
A small distance is formed between the reflection plate 9 and the alignment member 10 so that the reflection plate 9 and the alignment member 10 do not come into contact with each other. Reference numeral 12 denotes a discharge tube or a neon bulb supported by the support legs 11a of the insulator 11, which is lit by the microwaves that have passed through the gap between the reflector plate 9 and the alignment member 10, and is currently irradiating the microwaves. is now displayed.

A cover 13 is attached to the periphery of the opening of the main body 1 and covers the reflection plate 9 and the alignment member 10, and is made of a material that transmits microwaves, such as synthetic resin. 14 is a thermostat attached to the side of the air guide duct 7, and when the magnetron 2 is abnormally heated due to a failure of the air fan 8 and the air guide duct 7 reaches a predetermined temperature, the magnetron 2 is activated.
It is designed to stop energizing.

In use, the main body 1 is held by hand, and the output section 3 of the magnetron 2 is opposed to the affected area, that is, the cover 13 is opposed to and brought close to the affected area.

When the magnetron 2 is energized, the magnetron oscillates, and the output section 3 outputs microwaves.
Most of the microwaves are reflected by the matching member 10 and irradiated to the affected area, heating the affected area and promoting blood circulation. However, since the microwaves are reflected by the matching member 10, which has a smaller diameter than the reflecting plate 9, the irradiation is It is possible to narrow down the area and irradiate only the affected area. Also,
Since the alignment member 10 is formed in a cylindrical shape, its mechanical strength is increased, and even if the main body 1 is moved, the alignment member 10 does not vibrate, so that the directivity is not impaired.

Furthermore, impedance matching can be easily achieved by adjusting the dimensions of the reflecting plate 9 and the matching member 10, the mounting position of the matching member 10, and the like. The fundamental frequency of the microwave oscillated by magnetron 2 is
As an example of impedance matching in the case of 2450MHz, the inner diameter A of the open end of the reflecting surface of the reflecting plate 9 is
120mm, the inner diameter B of the reflective surface closed end of the reflective plate 9 is 80mm,
The height C from the open end to the closed end of the reflector plate 9 is 40
mm, the inner diameter D of the matching member 10 is 80 mm, the matching member 10
The height E is 38mm, the closed end of the reflector 9 and the alignment member 10
An example is a configuration in which the interval F between them is 10 mm.

On the other hand, the microwaves that have passed through the gap between the reflection plate 9 and the alignment member 10 are reflected by the reflection plate 9 and irradiated to the affected area.

(g) Effects of the invention As described above, according to the invention, since the matching member is formed in a cylindrical shape, it has stronger mechanical strength than conventional spiral antennas, and therefore has less vibration, making it suitable for microwaves. Directivity can be improved. Further, by adjusting the dimensions of the reflecting plate and the matching member, the mounting position of the matching member, etc., impedance matching can be easily achieved.

[Brief explanation of the drawing]

The drawings all show one embodiment of the present invention, in which Fig. 1 is a partially cutaway perspective view, Fig. 2 is a sectional view, and Fig. 3 is a sectional view of a reflecting plate and an alignment member. 1... Magnetron, 2... ...output section, 9...reflection plate, 10...matching member.

Claims (1)

[Scope of utility model registration request] In a magnetron device comprising a magnetron that oscillates microwaves and a reflective plate made of a conductive material that reflects the microwaves emitted from the output part of the magnetron, in a space surrounded by the reflective plate,
A magnetron device comprising a cylindrical alignment member made of a conductive material arranged concentrically with an output section of the magnetron.